When I eat and then swallow the food. Why do I start having trouble breathing, to be able to breath I have to drink water. Yes, I have asthma. But is this from my asthma or something else? What does this mean?

As the others state ... You need to speak to a doctor.

To expand on Thrice answer ... Acid reflux will also cause your esophagus to constrict, which makes it more difficult to swallow.

I have a similar problem, and talking with nurses at work ... It was because I wasn't chewing my food enough, before trying to swallow it.  Especially red meat, such as steak, which tends to not break apart when chewed.  So I've taken to eating smaller bites, and am really conscious about making sure it is thoroughly chewed before swallowing.